perf: Lazy load dashboard components

[juliusknorr]

Save loading and evaluating larger amounts of javascript on the early page load.

[juliusknorr]

@julien-nc Might be something nice for all the integration widgets at some point :)

[julien-nc]

👍
It does not work with a subpath on my local setup. I see a request to
https://nextcloud.local/apps/notes/js/notes-commons.js?v=1fe6d2ef17a17417d45d
while it should be
https://nextcloud.local/dev/server26/apps/notes/js/notes-commons.js?v=1fe6d2ef17a17417d45d

[julien-nc]

👍